Explosive-engine.



J. F. WOOLF.

EXPLOSIVE ENGINE. AYPLIOATION FILED 213.23, 1909.

Patented Aug. 2, 191i?.

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J. I'. WOGLF. EXPLOSIVB ENGINE. APPLEOATION 211.313 P2B. 2s, 1909.

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. 13.71952?, OF MNEll-QLS, MNNESOTA, ASSIGNOR OF ONE-HALF T0 ELLES J.

THGOLF, F MNNEPOLS, .MINNESQT.

EXPLOSVE-ENGINE.

,Specification of letters Patent.

Patenten aug. s, icio.Y

Application filed February 23, 1909. Serial No. 479,504.

new and useful Improvements in Explosive-Y Engines, of which thefollowing is a specitication. My invention relates to explosive engines,and its object is to provide a simple,'eiiicient, `and economical twostroke cycle explosive engine, and the improvements relate especiallv tothe means for transfer of the gases. The improvements are illustrated inthe accompanying drawings, in which- Figure l shows a central verticalsection of the entire engine. Fig. Q'is a transverse section on theirregular broken line a-o of Fig. l, viewed in the direction of thearrows and showing the bottom ol one of the explosion cylinders. Fig. isa transverse section on the line Zi-l), viewed in down ward direction,and Fig. l is a. like section on the line @#0, viewed in upwarddirection.

In such drawing l designates a pair of 1oase castings, and 2 a pair ofdiiierential cylinder castings which provide the main shell or casing.These castings, l and 2, are ot such shape that when secured togetherthey inclose and afford a bearingfor thecrank-shaft and also provide twocrank-shaft compression' chambers "it, A pair of explosion cylindercastings are secured on the castings 2 and are properly centered hymeans of the stud-lugs 6. They are provided vwith the usualwater-jackets 7 which are surrounded hy annular exhaust chambers 8 forreceiving the exhaust gases through the ports l) afforded between thecastings i2 and and thej7 are also provided with openings l0 orthe usualspark-plugs, (not shown).

ln the upper portions of the casing mem` bers 2 are arranged ring valves11.,.which with delivery ports l2, and nte the narrower members oi" A e'der memring valves, and the rims serve also as stops to limit thedownward movements of the ring valves` which have outward flanges l5 ontheir upper edges for engaging the top surfaces of the stops. The pairot' castings 2 are Secured together by joint flanges 16 which provide aport llconnecting the dit'- erential spaces 18 of the two cylinders; andthey are also provided with ports 19 for connecting the charging chamberwith the explosion chamber. The casings are provided with the usualspring` seated check valves 20.

In the cylinders are the dilierential pistons 2l which are connected bythe rods 22 to the cranks 23 on the common crank-shaft rlhe lowerandwider portions of the pistons are guided oy the casings and hy ribs 24provided therein, and their narrower upper portions engage the innerwalls of the ring valves ll with suicientfriction to reciprocate thelatter to the limits of their movements. The play -o these valves ishetween the rims 14 of the casings 2 and the bases 25 of the casings 5that. constitute the upper walls of the exhaust ports 9 anc also serveas stops for the valves.

The cycle of actions in operation is as tollows: Let it he assumed thatan explosion has taken place in the lett hand member ot the engine andthat the chamber a ot that. member is lilled with gast then theinitialmovement of the piston will lov frictional contact carry thering' valve from its upper position there shown to its lower position,shown in the right handmemher, and it will remain in that position, withthe exhaust port 9 open, during the remainder of the eX- plosion strokeof thev piston; and when the piston has moved tar enough to uncover thatport the exhaust vloegins and will `continue until the return movementof4 the piston moves the ring valve to close the port. Atpractically thesame time that the piston head uncovers the ringvalve ports widerportion of the piston will have moved past the port l0 to uncover it andallow the charginh action to hegin h3' the liow ot gas e nlosiou I l f.l 0:7

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l2 the the arrows in the right hand member. When the piston begins itsreturn stroke its head will lift tlie ring-valve in advance of it to theupper limit of the valve movement and to position to cause the cylinderrim 14,130 shut otf the valve ports 12 from communication with thepassage-way 18 and to cause the upper portion of thering-valve to closethe exhaust port 9, before the piston head slides upwardly within thering-valve past its ports 12. The compression of the gas in theexplosion chamber will begin as soon as the ring valve vis at restandthe piston moves upwardly within it. As the wider portion of the pistonagain covers the port 19 lthe'gas remaining in the passage-way 18 isfree to How through the port 17 to the space 18 in the other cylinder;and a fresh charge will be drawn into the compression chamber 4 throughthe check-valve 20. Upon the relturn of th'e piston to the positionshown in the left hand member the cycle of actions will have beencompleted.

Havingdescribed my invention, what I claim and desire to secure byLetters Patent isw 1. In a two-cycle explosive engine, the combinationwithcasing members providing compression and explosion chambers and anintermediate cylinder forming a part of the compression chamber, theupper end of the cated between the top of the cylinder and/r the base ofthe explosion chamber casing to alternately open and close the exhaustport, substantially as set forth.

2, In a two-cycle explosive engine, the combination 'with casing membersproviding compression and explosion chambers and an intermediatecylinder forming la part of the compression Chamber,thc .upper end ofthecylinder being separated from-an inner portion of the base of theexplosion chamber casing by a circular space constituting an A exhaustport, of a piston within the cylinder and casing members in position toseparate vthe compression chamber from the explosion chamber, aring-valve having ports for connecting the compression space with theexplosion chamber and arranged on and slidable wi. the upper portion ofthe piston and having a projection for engaging alternately the top ofthe cylinder and thebase'A the ring-valve is adapted to be reciprocatedbetween the top of the cylinder-and the base of'the explosion chambercasing to alternately open and close the exhaust port, and an inwardlyprojecting rim on the upper portion of the cylinder past which the portportion of the ring-valve reciprocates and which serves to close saidports when the ring-valve is at the limit of its upward reciprocation,substantially as set forth.v

3. In a two-cycle explosive engine, the combination with casing membersproviding compression and explosion chambers and an intermediatecylinder forming part of the compression chamber and havingV its lowerportipn wider than its body, of a piston within the cylinder and casingmembers in l position to separate the compression chamber V'from theexplosion chamber and having its lower portion wider than lits body andfitting the narrower portion of the vcylinder but separated from thewider portion of the cylinder by a spa-ce when the piston is near thelimit vof its down stroke, a ring-valve slidable on and with the upperportion of the piston and provided with ports past which the piston headslides, stops on the cylinderand upper casing member for limiting thering-valve movements, the piston and lring-valve being arranged withreference to the cylinder tovprovide an intermediate fluid passage-waywhich the ring-valve ports connect with the explosion chamber as wherebythe lower and wider portion of the 'the piston nears the end of its downstroke,

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piston controls the 'ow of gas fromthe compression chamber to saidpassage-wayvv and the narrower body portion controls the flow of 'gasfrom the passage-way throughthe ring-valve ports to the explosionchamber, substantially as set forth.

4C. In a two-cycle explosive engine, the combination with casingmembers'providing compression and explosion chambers vand anintermediate cylinder forming part of the compression chamber and havingits lower portion wider than its body, oa piston" within the cylinderand casing members in position to separte thecom ression cham: ber from'the explosion cham er and having' its lower portion widerv than itsbody and itting the narrower portion of thecylinder but separated fromthe wider. portion'o'f the cylinder by a space. when the piston is nearthe limit of its down stroke, a' ring-valve slidable on and with theupper Lportion of vthe piston and provided with ports past which thepiston head slidbs, stops on the cylinder and upper casing member forlimiting the ring-valve movements, the piston and ring-valve beingarranged with reference to the cylinder to provide an intermediate fluidpassage-way which 'thering-valve ports connect with the explosionchamber as the piston nears, the end of its down stroke,

and an inwardly projecting rim on the upper name to this specificationin the presence of portion of the eyirider past which the port twosubscribing Witnesses this 17 th day of portion of the ring-Valvereoiprocates and February 1909,.

which serves to Close said ports When the JAY F. VVOOLF. 5` ringwalve isat the limit 'of its upward Witnesses:

stroke, substantially as set forth. JNO. D. FARRAND` In testimonywhereof I have signed my CEAS. H. DIXON"

